How can i Delete sequences from stack or queue?

Question

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Answer 1

Totally depends on language and whether you coded it or are using a library. Please edit this post to add enough information to get realistic answer.
https://www.sololearn.com/Discuss/333866/?ref=app

Answer 2

In java, you have stack that ordered like this:
1,1,2,2,2,3,3,3,4,4

Turn it to this:
1,2,3,4

Answer 3

If you can also solve this problem in queue it will be realy good